Tire pump



i. I. y

ROBERT H. BOTTS, OF PARKER, ARIZONA.

TIRE PUMP.

Application led January 17, 1923. Serial No. 613,188.

`To all 107mm it mag/concern.' y

Be it known that I, Ronnn'r H.Borrs, a citizen ot' the United States, residing at Parker, in the county of Yuma, State of Arizona, have invented certain new and useful Improvements in Tire Pumps; and T do hereby declare the 'following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to maire and use the same.

, This invention relates to new and useful improvements in pumps and particularly to pumps used for inflating pneumatic tires.

One object of the invention is to provide a pump which is adapted to be driven by the piston of one of the cylinders of an automobile engine, and is adapted to be readily carried in a tool box, when not in use.

Another object is to provide a pump or" this character which is adapted to be screwed into the spark plug hole of a cylinder of an engine, after the plug has been removed, the plunger of the pump piston being arranged to be driven upwardly by the piston oi the engine, and to be returned by a spring within the pump cylinder.

Other objects and advantages will be apparent from the following description when taken in connection with the accompanying drawing.

Tn the drawing:

Figure 1 isan elevation ott a portion of an automobile engine showing the pump in position thereon.

Figure 2 is a vertical sectional view on Vthe line 2-2 of Figure 1, passing through the engine cylinder and pump.

Referring particularly to the -accompanying drawing, 10 represents a port-ion of an automobile engine, having the cylinders 11, from one of which the spark plug has been removed, leaving the spark plug hole 12, and into which the nipple 13, ofV the pump cylinder 14 is screwed. The cylinder 14 has the heads 14 which are heldV in clamping engagement with the ends of the cylinder wall by the externally arranged, longitudinally extending bolts 24. Two of these bolts are extended beyond the outer head of the cylinder, for a purpose which will appear later herein. Within the cylinder 14 is a piston 15, which has a stem or rod 16, slidable through the nipple 13, and into the engine cylinder to be engaged by the piston 17 o the engine cylinder. Between the piston 15 and the outer head 14 of the pump cylinder, is disposed a strong coil spring 18 which normally urges the piston toward the inner end of the cylinder, and the stem 16 into position to be engaged by the piston 17. In the outer head 14 there is connected a hose 19 for conveying air from the pump to a. tire. Also mounted in the outer end of the cylinder 14 is a relief valve 20, held within its seat by a U-shaped spring 21. Engaged on the outer ends of the projecting bolts 24 is a transverse bar 22, and connected to this bar is the other end of the U-shaped spring 21. Tn the inner head of the cylinder 14 are formed openings 23v which serve to permit ready escape, from the cylinder, of air which accumulates back of the piston 15. The bolts 24 are held to the cylinder and to the bar 22 by the nuts 27, and by turning down the nuts on the projecting bolts 24 the tension of the spring 21 may be increased, to hold the valve to its seat against a predetermined pressure of air from within the cylinder 14.

Tn the outer head 14" of the cylinder 14 there are formed the series of inta-ke openings 30 for air to enter the cylinder, and disposed between this outer head and the end of the cylinder wall, is a leather washer disk 28, the same covering the said openings, and having an opening 29 in its center. rThe outer end of the spring 18 also bears against this washer.

l/Vhen the piston 15 moves inwardly in a direction toward the enginecylinder, under the pressure or the spring 18, air will be sucked into the cylinder through the openings 30, causing the washer disk 28 to tier: inwardly, and permit the air to pass through its central opening, into the cylinder. When the piston moves outwardly, under the influence 01"' the engine piston, which engages against the rod 16, the air will be driven out through the opening 29 to the air hose 19, and at the same time the air pressure forces the lea-ther washer against the openings 30, thus closing them against escape of air therethrough. Should the pressure of air from the cylinder 14 be excessive, the valve 20 will be unseated and the excess of air escape therethrough.

There is thus provided a simple and eicient device which can be readily and easily carried in the tool box, and the application of the saine to operative position of which requires theremoval of the spark plug ot a cylinder, and the screwing into the spark plug hole the nipple of the pump. The rod of the pump piston is engaged with the engine piston and is driven outwardly thereby, while the spring 18 serves to Vreturn the piston l5 back to its initial position.

In the nipple to which the hose 19 is connected is arranged a check valve to prevent back pressure.

What is claimed is:

In an inlating pump, a cylinder having terminal heads, bolts disposed longitudinally and externally of the cylinder and through the edge portions of the heads, certain of the bolts projecting beyond one of the heads, a bar having terminal eyes reclamping and adjusting nutson the projeot-V .ing bolts for regulating the tension of said spring. i

In testimony whereof, I aix my signature, 1n the presence of two witnesses.

. ROBERT H. BOTTS. Witnesses: A

J. M. MARLow, B. M. FUGUE. 

